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194 NOTES, REVIEWS, ETC. 

The same author (Jour. Exp. Zool., Aug., 1913) discusses in a 
much more extended way the many interesting questions of heredity 
suggested in the more general article. 

PERSISTENCE OF BACILLUS ABORTIVUS IN TISSUES. 

Fabyan (Jour. Med. Research, May, 1913) presents facts to 
show that B. abortivus has a quite prolonged life in the tissues of 
apparently healthy laboratory animals — as guinea pig, rabbit, mouse, 
rat, pigeon, etc. In one instance they were harbored without any 
external signs of ill effects for 67 weeks. Two additional conclu- 
sions seem warranted from the experiments : First, that there 
seems to be at least a slight temporary multiplication of the germs 
after inoculation ; and, second, that the animals are not without the 
power slowly to destroy the bacilli. 

The study is interesting as bearing on possible periods of en- 
durance and latency of pathogenic bacteria after the disappearance 
of the symptoms of the disease. 

PERSISTENCE OF TUBERCLE BACILLI IN CULTURES 

Smith (Jour. Med. Res., May, 1913) tests the current view 
that tubercle bacilli lose their vitality in cultures in periods of i to 
6 months. He found that cultures which completely ceased to mul- 
tiply on the artificial media under wholly favorable conditions were 
still infectious to guinea-pigs for from 7-19 months. This was true 
both of human and bovine strains ; though of the two types when 
reared side by side the bovine is the more resistant. It is true that 
the number of bacilli surviving in such cultures is very small. The 
series of biological facts is suggestive: Tubercle bacilli (bovine), 
which on removal from the diseased animal do not at first multiply 
on glycerine agar, may in time become partially saprophytized and 
grow luxuriantly on such culture media; gradually this culture 
medidm fails to serve their purpose, and most of them die ; as long 
as vitality lasts the fresh tissues of the guinea-pig furnish an ade- 
quate medium for their restoration. 

CAMBIUM GROWTH IN AMERICAN LARCH 

Knudson (Bui. Tor. Bot. Club, June, 1913) presents a study 
of the American larch in respect to place and time of beginning of